User blog comment:GalaxiaWild/What did Vergil intend to do with Sparda's power in DMC3?/@comment-201.173.19.151-20130802173823

The Trinity of Fates DVD Book implied that he didn't care much one way or the other about conquering the world (or humanity in general, for that matter) but that he was trying to live up to Sparda's legacy in his own way.

My guess? Considering Vergil's guilt following the death of Eva, as shown in his first battle with Dante and with that weird hallucination/flashback he saw near the end of the DMC3 manga, his motives were more along the lines of vengeance than anything else. Kinda like what Dante did most of the time, hunting down demons and hoping to eventually hit the jackpot, except that rather than waiting for them to show up he would take the battle directly to them.

If you never heard of the Trinity of Fates, just search for it here.